Improvement in set-works for circular-saw mills



Z'She'etr-Sheetl.

C.f :-,M. HALL; r A .smfwomsroncIRcUL'AnsAwfMILLs. V N 1371,5Zz l l Patented Feb. 20,5187?.

N- PEERS. PHOTD-LITHOGRAPHER, WASHINGTON, DA C.

UNITED s OHANCEY M. HALL,YOF BAY CITY., MICHIGAN, ASSIGNOR OF ONE-HALF HIS RIGHT TO BAY CITY IRON COMPANY, OF SAME PLAGE.

l g IMPROVEMENT :N SET-WORKS FOR ciRcuLAR-SAW MILLS.

Specification forming part of Letters Patent No. 187,622, dated February 20, 1877; application i'iled September 5, 1876. u

To all. 'whom it may concern: l

Be it known that I, CHANGEY M. HALL, of Bay City, in the county of Bay and State of Michigan, have invented an Improvement in Set-Works for Circular-Saw Mills,ol' which the following is a specification The nature of my invention relates to an improvement in set-Works for circular-saw mills of that class in'which the set-shaft is, divided, so that either knee maybe advanced or receded independently of the other, or both knees actuated synchronously.

The object I have in view is to enalole the operator to set the knees one-sixteenth of an inch or more at a single movement of the setlever. To this end my invention consists, mainly, in the peculiar construction and combination of the various parts, as more fully hereinafter set forth.

Figure l, Sheet l, is a perspective view of my improved set-Works as'applied to the carriage, and showing one knee thereof. Fig.2s a horizontal section ofthe same at w w. Fig. 3, Sheet 2, is a cross-section at y y. Fig. 4 is a detached perspective view of one of the ratchet-collars, showing the ratchets on the edge and side thereof. Fig. 5 isa sectional side elevation of a paWl-drum, looking at it from the outer side. Fig. 6 is a sectional plan of the same at z z, showing the pawl or dog and its spring in position. Fig. 7 is a detached perspective view of a cam-collar removed from the drum. Figs. 8 and 9 are similar views of thc main pawls, each mounted on its geared collar. Fig. l0 is a similar view of 011e of the side pawls or dogs, and its spring detached from its drum.

In the drawing, A represents a portion of the carriage of a circular-saw mill. Bis a knee, geared on the under side, sliding in Ways C, and actuated by the pinion a at the end ot' the set-shaft D, which is journaled through the inner web of the ways O. E E' are two ratchet-wheels, the former having a long, laterallyextended hub, which is sleeved over the setY shaft ends, the set-shaft being divided into two independent parts at that point. The wheel E' has also a laterally-extended hub, which is sleeved over that of the Wheel E. This is done to admit of two paWl-collars, F

F', Ybeing sleeved upon the hub 'of thewheel E'. A set-screw, b, is tapped through collar F', and through the hubs of both wheels, to key them together.' Each ratchet-wheel, it Will be inoticed, carries a ratchet on its periphery, and another on its outer face, pitched in the opposite direction, as seen in Fig. et. With the peripheral ratchets engage, respectively, the pawls Gr Gr', pivoted to the sides of arms extended back from said collars F F', re spectively. rI he end of the arm ot' the collar F is a geared segment, c,while that of the collar F' has a pendent internally-geared segment,

c. Thepitches ot' these gears dii'er, that ot' the gear c' being the greatest. Between the geared segments c c', and meshing With both, is a differentially-geared pinion, d, keyed on a rock-shaft, H, journaled along the outer sill of the'carriage, and provided with a set-lever, I. The pitch otI one-half the teeth ofthe said pinion (those that engage with the outer. segment c) is greater than those of the other half ot' said pinion, so as to give the arms of the paWl-collars an equal throw. At the side ot' each ratchet-Wheel adrum, J, is keyed on each section of the set-shaft, with three radial slots, e, out in its head, at the side of which is a roundspring-socket, e', connecting therewlth by a longitudinal slot, as seen in Figs. 5 and 6.

f, Fig. l0, isV a Wedge-ended dog, inserted in the slot e, with a lateral pin, g, on one side, Which projects into the spring-socket through the slot. A spiral spring, h, is then inserted in the socket, resting on the ping, and the socket is then capped, to compress the spring and cause it to bear upon the pin, to project the dog and have it engage With the ratchet at the side of the ratchetwheel in the forward or setting 7 movement of the latter. ln re ceding the knee the open edge of the drum is used as a hand-wheel, when these dogs do not engage with the ratchetwheel 5 butin the setting movement of the ratchets one or more of them will be constantly engaged with it, and thus rotate the set-shaft.

When zitis desiredto saw Wedge-shaped lumber or strips, either end of the set-shalt may be thrown out of gear by the following means: At the inner edge of each dog j' there is cut a recess, i, just under the head, which reframe, or to a bracket thereon.

2 nsmcee eeives the periphery of a'plley or collar, K, sleeved on the internal hnb'of' thedrnm. The outer end of the hub of this collar4 carriesa smaller collar, in which there is out a diagonal or cam slot, 7c, into which projects the end of an arm, Z, permanently secured to the'main The cam-collar carries a lever', L, by Which it can be rotated on the drumhub, and in .raising said ie- Ver the cam-slot, running on the end of the arm l, causes the'said cam-collar to slide laterally upon the drum-hub. and thus retract into the drum the ends of the dogs. In this Way either end of the set-shaft may he thrown out of' gear; or both ends may be rotated simlllta-v neously to set the knees. The main ratchets are proportioned to set the knees one-sixteenth of an inch for each ratchet-tooth.

What I claim as my invention is- 1. The differentially-pitched segments c c',

vin combination With the pinion d of the rocksha't', having corresponding' pitches, for im parting an equal throw to the paWl-collars F F', substantially as described.

2. The combination, with the drums J J and their dogs f, the diagonally-slotted cam-collars K, levers L, and the stationary arms l, for retracting said dogs from, the ,plain ratchetwheels, substantially as described.

3. In combination with a divided set-shaft, the double ratchet-Wheels,j theI paWl-carrying drum on each section of said Setshaft, the differentially-pitched pawl -carrying segments,r and a correspondingly-pitchedpinion on an intermediate rock-shaft, all combined and arringed to impart an equal movement to both 

